The Bank of England has injected another 50 billion pounds ($66.271 billion) into the British economy as it extended its quantitative easing (QE) program. Its monetary policy committee also opted to maintain its benchmark interest rate unchanged at 0.5%.

A growing chorus of critics is questioning the efficacy of the Fed’s latest attempt to put downward pressure on long-term interest rates and “help make broader financial conditions more accommodative”—also known as Operation Twist.